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ALEXANDER  VON  HXJMBOLDT.                  97
Kunth, and  delivered to him the material for the
compilation of several works, which  have  appeared
under the titles,  " Famille des Miroosac^es et autres
Plantes Mgumineuses ; *'   also   " Grammees Hares de
rAmerique Equinoxiale ;'"* and " Nova Genera et Spe-
cies Plaiitamm;" and of which the latter, seven folio
volumes, with 700 copper-plates, describes 4500 plants
which   Humboldt   and   Bonpland   had   collected   in
America.    A projected   " G^ographie   des   Plantes/"
which was to be illustrated by twenty copper-plates,
of which several were to give a picturesque delineation
of the character of the vegetation, was not realized,
In physics,   geology.,   and   astronomy,  Humboldt
also produced  a number of works, which he either
composed himself, or gave the materials from his rich
treasures.    With Altmami's  assistance, two volumes
appeared, called " Observations Astroiiomiques," which
contain the calculated observations made by Hum-
boldt between the 12th degree of south and the 4<lst
degree north latitude, on the passage of the  sun and
the stars through the meridian, on the obstruction of
planets and moons, on eclipses, refraction of light in
the torrid zone, and barometric measurements of the
Andes of Mexico, Venezuela, Quito,  and  New Gra-
nada,   and which were  accompanied by a chart on
which 700 geographical localities are determined.    A
comparative description of all geological formations of
the old and new world was given by Humboldt in the
work,   " Essai  sur le gisement des dans les
deux Hemispheres/* which was translated into German
by  von Leonhardt.      The   "Tableau Physiques des
Regions Equinoxiales"  contains a universal physical
survey of the chief phenomena of natural and geolo-
gical existence ; and a special treatise " Sur les lignes
Isothermes " gives the doctrine of climate, especially
the fundamental principles of the medium tempeta-
tures of the earth's surface, which study he continued
in subsequent years.     The before-mentioned "Vue
des Cordilleras" contains many descriptions of phy-
sical life, which properly belong here ; and a work,